I've updated my list and always reviewed products and got involved with discussion but how do you become a tester. Lots of people seem to be able to but I'm not sure whether I'm doing the right thing

Have you read the sticky thread on testing? It's on the front page of the forum and contains useful information and links to previous threads on this subject.

There are thousands of people wanting this amazing opportunity so unfortunately not everybody will get to become a tester. It's a privilege not a right. Keep writing reviews and updating your list and you may be chosen one day👍🏼